Body polishing
Only a few defects can be corrected by the polishing process. If there is corrosion, chips or damage on the body, through which the steel frame is visible, then major repairs will be required.
Before starting the polishing process, you should thoroughly inspect the vehicle to ensure that the defects can be corrected.
Body treatment with a special device will give a positive result when:
- a slight difference in shades, which turned out after partial staining;
- the presence of roughness, scratches and cloudy stains;
- a faded layer of paint;
- the appearance of grit and streaks of enamel.
You need to know that you cannot abuse polishing, because when it is done, the paint layer becomes 5 micrometers less. From the date of vehicle manufacture, no more than 20 polishing procedures can be performed. At this time, you need to use a thickness gauge, especially if the car is supported.
Homemade drill bits
In addition to the natural desire to spend less, home craftsmen are often driven by a desire for knowledge and self-expression. A couple of such projects for making devices from scrap materials are given below.
Homemade nozzle based on a car valve
Automotive valve based
A good set can be made based on valves from a car engine. These parts are characterized by high strength, precision workmanship and excellent balance.
The flat surface of the valve should be well degreased, and the head of the required shape should be fixed with glue. The heads can be made of wood, heavy rubber, or hard foam. On a round sheet of sandpaper, draw a circle with a diameter equal to the diameter of the head, and make cuts from the edge to the intended circle. The central part is glued to the base, and the petals are wrapped on the back of the head and glued to it or fastened with construction brackets.
Simple screw fixture
If a car valve may not be on hand, then a long screw, a pair of washers and a nut can be found in any home workshop.
Simple screw fixture
Sandpaper should be cut into squares and a hole made in the center, 4-5 such squares should be put on the screw and clamped with a nut between the washers.
You will get the simplest nozzle for a fan-type drill. The screw is clamped in the chuck and hard-to-reach places can be cleaned.
The thread will soon get jammed by the drill chuck, in this case the master takes the next screw from the box.
Polishing attachment
The previous design is taken as a basis, but a circle cut from felt is clamped between the washers. For better polishing, the felt is rubbed with GOI paste.
Self-made devices do a good job with relatively flat surfaces; for surfaces with complex relief, you will have to use purchased ones.
DIY polishing attachment
Self-grinding errors
Most home craftsmen grind a wooden house with a household-class grinder, which is not convenient to work with, has a low power, and quickly overheats. A household appliance is not capable of sanding wood at a good quality level.
Professional equipment is expensive, so not everyone can afford it. But even if you buy such a model, you need to be able to use it, otherwise, with inept handling, high-quality grinding will still not work.Many people make the mistake of working at high RPM by pressing hard on the tool, which leads to surface damage.
The wrong choice of attachments does not lead to anything good either. In the best case, the surface will simply be poorly sanded, and in the worst case, cases of injury are not excluded.
Advantages and disadvantages of nozzles
Figure 3. Pros and cons of the drill
Grinding attachments have advantages that unfortunately could not exist without some disadvantages. The benefits include:
- increasing the functionality of the drill;
- accessibility of attachments;
- a huge number of varieties that allow you to perform any work;
- most attachments do not require skills from the master to use;
- the convenience of use;
- the ability to process parts in hard-to-reach places, which is not possible with a large grinding machine
Disadvantages:
- performance is lower than that of specialized tools;
- some attachments require skill and experience;
- in some situations, the use of attachments can cause a number of inconveniences;
- you have to hold a heavy drill in weight;
- is an auxiliary tool.
The use of grinding attachments will allow you to achieve almost production results at home. The quality of work will be worse, and much more time will have to be spent. But on the other hand, the cost of such works is much lower, which makes them accessible to any person.
Views
Knowing the features and general characteristics of grinding attachments, you should proceed to consider specific models that are often used in various types of work.
Poppet nozzles are presented in a similar version of standard disk nozzles. The only difference between the two is design. Instead of a thread, there is a special fastening pin in the chuck. In some cases, these pins can be adjusted, so that you can make smooth movements along the contour of the surface to be treated. In addition to plastic material, plate nozzles are made of rubber. These models no longer have a movable pin, due to which they are firmly attached to the base of the tool.
- The fan-shaped ones resemble the image of a disc, the edges of which have a special fastening for the processing material. For hard-to-reach surfaces, the fan-shaped nozzles are second to none. It is worth noting their design feature. During operation, the nozzle can use any desired shape, which is very convenient when processing surfaces with a complex geometric pattern.
- The polishing model with a soft tip is mainly made of foam, felt or leather. Fasteners are presented in the form of a pin with special washers for clamping. Quite often, these attachments are used in polishing work, especially in auto repair shops.
Types of polishing attachments
By type, drill polishing attachments can be divided according to their shape into cup and disc. Cup attachments work with a surface that is perpendicular to the axis of rotation. Disc - a narrow cylindrical surface that is parallel to the axis of rotation.
If you are polishing, then you know that it is necessary to use special pastes. They are applied to a soft material base.
As such a material in the polishing attachments, they use a fleecy cloth, foam rubber, a special polishing mat, from which polishing linings, synthetic materials can be cut.
All kinds of squiggles also differ from each other. It is customary to divide the corners into hard and soft. Rigid braces are the cheapest, and they use cable cuttings as a material to remove rust.
They do a good job of removing rust from uncomplicated surfaces, especially quickly removing thick layers of rust that can chip. The second type of corners is soft corners.
They are made from single wires of great length, so they can "bend" surfaces and are used for polishing complex surfaces. Like all other attachments, the corners are cup-type and disc-type.
Abrasive nozzles made of sandpaper are divided into those where a sheet of sandpaper is rigidly fixed on the working surface, and those where there are many sheets of sandpaper that have one free end. In the process of work, the last nozzles can also slightly bend around the surface to be treated and work with curved surfaces.
Also, the latter can then be used as a basis for applying polishing paste - when the abrasive layer from the skin has already peeled off. Use only cloth-based sandpaper for polishing attachments - paper sandpaper will not be very durable.
Abrasive stone bits are a very common tool in the DIY arsenal. Typically, the power of the drill will not be sufficient to pull a normal grinding wheel.
Therefore, nozzles for large-diameter drills are used. To work with them, it is advisable to use only a high-speed drill, since such nozzles are designed for a shaft rotation speed of 6-12 thousand revolutions.
Grinding and polishing attachments
Drill bits for grinding and polishing allow you to perform a wide range of work. The main ones are:
- cleaning parts before painting or welding;
- grinding and leveling surfaces;
- final finishing and polishing of surfaces made of metal, wood, plastic or glass, as well as paint and varnish coatings;
- glass edge processing after cutting.
They allow you to avoid the purchase of expensive specialized equipment. It should be remembered that with a large amount of work, the drill will not be able to provide the proper level of performance and will wear out quickly, since it is not designed for constant loads perpendicular to the axis of the working shaft.
Drill bits for grinding and polishing
Devices for grinding and polishing differ not only in the shape of the working body, but also in the degree of hardness of its material by:
- tough;
- soft;
- super soft;
- embossed.
It is not possible to perform a sanding and polishing operation from start to finish with one tool. A home workshop should have a set of such devices.
How to choose
Figure 9. Selecting a manufacturer
The devices are sold under many brands, many of which are also tool makers. It can be difficult to choose one among the variety.
It is recommended to pay attention to the products of well-known brands that have long established themselves in one area or another. The most widespread are the products of Makita, Bosch, Verto, Praktika, Zubr. If you do not buy products from nameless manufacturers, you can significantly reduce the likelihood of buying a not-so-good product.
Do not forget that the purchase of a device is already an economy in itself, compared to the selection of professional grinding equipment.
But before choosing a manufacturer, it is better to understand the basic requirements for the tool. Determine for which works the component is being purchased. It is worth determining the characteristics of the drill. After all, if it is bad to choose a nozzle for a specific model of a tool, then you will not have to think about high-quality work.